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package backendapi
import (
"WarpGPT/pkg/common"
"WarpGPT/pkg/funcaptcha"
"WarpGPT/pkg/logger"
"WarpGPT/pkg/plugins"
"WarpGPT/pkg/plugins/service/wsstostream"
"WarpGPT/pkg/tools"
"bytes"
"encoding/json"
http "github.com/bogdanfinn/fhttp"
tls_client "github.com/bogdanfinn/tls-client"
"github.com/gin-gonic/gin"
"io"
shttp "net/http"
"strings"
"time"
)
var context *plugins.Component
var BackendProcessInstance BackendProcess
type Context struct {
GinContext *gin.Context
RequestUrl string
RequestClient tls_client.HttpClient
RequestBody io.ReadCloser
RequestParam string
RequestMethod string
RequestHeaders http.Header
}
type WsResponse struct {
ConversationId string `json:"conversation_id"`
ExpiresAt time.Time `json:"expires_at"`
ResponseId string `json:"response_id"`
WssUrl string `json:"wss_url"`
}
type BackendProcess struct {
ConversationId string
Context Context
}
func (p *BackendProcess) GetContext() Context {
return p.Context
}
func (p *BackendProcess) SetContext(conversation Context) {
p.Context = conversation
}
func (p *BackendProcess) ProcessMethod() {
context.Logger.Debug("ProcessBackendProcess")
var requestBody map[string]interface{}
var ws *wsstostream.WssToStream
err := p.decodeRequestBody(&requestBody)
if err != nil {
p.GetContext().GinContext.JSON(500, gin.H{"error": "Request json decode error"})
context.Logger.Error(err)
return
}
request, err := p.createRequest(requestBody)
if err != nil {
p.GetContext().GinContext.JSON(500, gin.H{"error": "Server error"})
context.Logger.Error(err)
return
}
if strings.Contains(p.Context.RequestParam, "/conversation/ws") {
ws = wsstostream.NewWssToStream(p.GetContext().RequestHeaders.Get("Authorization"))
err = ws.InitConnect()
}
if err != nil {
p.GetContext().GinContext.JSON(500, gin.H{"error": err.Error()})
context.Logger.Error(err)
return
}
context.Logger.Debug("Requesting to ", p.GetContext().RequestUrl)
response, err := p.GetContext().RequestClient.Do(request)
if err != nil {
var jsonData interface{}
err = json.NewDecoder(response.Body).Decode(&jsonData)
if err != nil {
p.GetContext().GinContext.JSON(500, gin.H{"error": "Request json decode error"})
context.Logger.Error(err)
return
}
p.GetContext().GinContext.JSON(response.StatusCode, jsonData)
context.Logger.Error(err)
return
}
common.CopyResponseHeaders(response, p.GetContext().GinContext)
if strings.Contains(response.Header.Get("Content-Type"), "text/event-stream") {
err = p.streamResponse(response)
if err != nil {
p.GetContext().GinContext.JSON(500, gin.H{"error": err.Error()})
context.Logger.Error(err)
return
}
}
if strings.Contains(response.Header.Get("Content-Type"), "application/json") {
if strings.Contains(p.Context.RequestParam, "/conversation/ws") {
context.Logger.Debug("WsToStreamResponse")
p.WsToStreamResponse(ws, response)
} else {
err = p.jsonResponse(response)
if err != nil {
p.GetContext().GinContext.JSON(500, gin.H{"error": err.Error()})
context.Logger.Error(err)
return
}
}
}
}
func (p *BackendProcess) WsToStreamResponse(ws *wsstostream.WssToStream, response *http.Response) {
var jsonData WsResponse
err := json.NewDecoder(response.Body).Decode(&jsonData)
if err != nil {
context.Logger.Error(err)
}
ws.ResponseId = jsonData.ResponseId
ws.ConversationId = jsonData.ConversationId
p.GetContext().GinContext.Writer.Header().Set("Content-Type", "text/event-stream")
p.GetContext().GinContext.Writer.Header().Set("Cache-Control", "no-cache")
p.GetContext().GinContext.Writer.Header().Set("Connection", "keep-alive")
ctx := p.GetContext().GinContext.Request.Context()
for {
select {
case <-p.GetContext().GinContext.Writer.CloseNotify():
logger.Log.Debug("WsToStreamResponse Writer.CloseNotify")
return
case <-ctx.Done():
logger.Log.Debug("WsToStreamResponse ctx.Done")
return
default:
message, err := ws.ReadMessage()
if err != nil {
context.Logger.Error(err)
break
}
if message != nil {
data, err := io.ReadAll(message)
if err != nil {
context.Logger.Error(err)
return
}
_, writeErr := p.GetContext().GinContext.Writer.Write(data)
if writeErr != nil {
return
}
p.GetContext().GinContext.Writer.Flush()
if strings.Contains(string(data), "data: [DONE]") {
return
}
}
}
}
}
func (p *BackendProcess) createRequest(requestBody map[string]interface{}) (*http.Request, error) {
context.Logger.Debug("BackendProcess createRequest")
var request *http.Request
if p.Context.RequestBody == shttp.NoBody {
request, _ = http.NewRequest(p.Context.RequestMethod, p.Context.RequestUrl, nil)
} else {
token, err := p.addArkoseTokenIfNeeded(&requestBody)
if err != nil {
return nil, err
}
bodyBytes, err := json.Marshal(requestBody)
request, err = http.NewRequest(p.Context.RequestMethod, p.Context.RequestUrl, bytes.NewBuffer(bodyBytes))
if token != "" {
p.addArkoseTokenInHeaderIfNeeded(request, token)
}
if err != nil {
return nil, err
}
}
p.buildHeaders(request)
p.setCookies(request)
return request, nil
}
func (p *BackendProcess) buildHeaders(request *http.Request) {
context.Logger.Debug("BackendProcess buildHeaders")
headers := map[string]string{
"Host": context.Env.OpenaiHost,
"Origin": "https://" + context.Env.OpenaiHost + "/chat",
"Authorization": p.GetContext().GinContext.Request.Header.Get("Authorization"),
"Connection": "keep-alive",
"User-Agent": context.Env.UserAgent,
"Content-Type": p.GetContext().GinContext.Request.Header.Get("Content-Type"),
}
for key, value := range headers {
request.Header.Set(key, value)
}
if puid := p.GetContext().GinContext.Request.Header.Get("PUID"); puid != "" {
request.Header.Set("cookie", "_puid="+puid+";")
}
}
func (p *BackendProcess) jsonResponse(response *http.Response) error {
context.Logger.Debug("BackendProcess jsonResponse")
var jsonData interface{}
err := json.NewDecoder(response.Body).Decode(&jsonData)
if err != nil {
return err
}
p.GetContext().GinContext.JSON(response.StatusCode, jsonData)
return nil
}
func (p *BackendProcess) streamResponse(response *http.Response) error {
context.Logger.Debug("BackendProcess streamResponse")
client := tools.NewSSEClient(response.Body)
events := client.Read()
for event := range events {
if _, err := p.GetContext().GinContext.Writer.Write([]byte("data: " + event.Data + "\n\n")); err != nil {
return err
}
p.GetContext().GinContext.Writer.Flush()
}
defer client.Close()
return nil
}
func (p *BackendProcess) addArkoseTokenInHeaderIfNeeded(request *http.Request, token string) {
context.Logger.Debug("BackendProcess addArkoseTokenInHeaderIfNeeded")
request.Header.Set("Openai-Sentinel-Arkose-Token", token)
}
func (p *BackendProcess) addArkoseTokenIfNeeded(requestBody *map[string]interface{}) (string, error) {
context.Logger.Debug("BackendProcess addArkoseTokenIfNeeded")
model, exists := (*requestBody)["model"]
if !exists {
return "", nil
}
if strings.HasPrefix(model.(string), "gpt-4") || context.Env.ArkoseMust {
token, err := funcaptcha.GetOpenAIArkoseToken(4, p.GetContext().RequestHeaders.Get("puid"))
if err != nil {
p.GetContext().GinContext.JSON(500, gin.H{"error": "Get ArkoseToken Failed"})
return "", err
}
(*requestBody)["arkose_token"] = token
return token, nil
}
return "", nil
}
func (p *BackendProcess) setCookies(request *http.Request) {
context.Logger.Debug("BackendProcess setCookies")
for _, cookie := range p.GetContext().GinContext.Request.Cookies() {
request.AddCookie(&http.Cookie{
Name: cookie.Name,
Value: cookie.Value,
})
}
}
func (p *BackendProcess) decodeRequestBody(requestBody *map[string]interface{}) error {
conversation := p.GetContext()
if conversation.RequestBody != shttp.NoBody {
if err := json.NewDecoder(conversation.RequestBody).Decode(requestBody); err != nil {
conversation.GinContext.JSON(400, gin.H{"error": "JSON invalid"})
return err
}
}
return nil
}
type ReverseBackendRequestUrl struct {
}
func (u ReverseBackendRequestUrl) Generate(path string, rawquery string) string {
if strings.Contains(path, "/ws") {
path = strings.ReplaceAll(path, "/ws", "")
}
if rawquery == "" {
return "https://" + context.Env.OpenaiHost + "/backend-api" + path
}
return "https://" + context.Env.OpenaiHost + "/backend-api" + path + "?" + rawquery
}
func (p *BackendProcess) Run(com *plugins.Component) {
context = com
context.Engine.Any("/backend-api/*path", func(c *gin.Context) {
conversation := common.GetContextPack(c, ReverseBackendRequestUrl{})
common.Do[Context](new(BackendProcess), Context(conversation))
})
}
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